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<body class="manpage">
<div id="header">
<h1>gitfaq(7) Manual Page</h1>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>gitfaq - Frequently asked questions about using Git</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>gitfaq</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The examples in this FAQ assume a standard POSIX shell, like <code>bash</code> or <code>dash</code>,
and a user, A U Thor, who has the account <code>author</code> on the hosting provider
<code>git.example.org</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configuration">Configuration</h2>
<div class="sectionbody">
<div id="user-name" class="dlist">
<dl>
<dt class="hdlist1">What should I put in <code>user.name</code>?</dt>
<dd>
<p>You should put your personal name, generally a form using a given name
and family name.  For example, the current maintainer of Git uses "Junio
C Hamano".  This will be the name portion that is stored in every commit
you make.</p>
<div class="paragraph">
<p>This configuration doesn&#8217;t have any effect on authenticating to remote services;
for that, see <code>credential.username</code> in <a href="git-config.html">git-config(1)</a>.</p>
</div>
</dd>
</dl>
</div>
<div id="http-postbuffer" class="dlist">
<dl>
<dt class="hdlist1">What does <code>http.postBuffer</code> really do?</dt>
<dd>
<p>This option changes the size of the buffer that Git uses when pushing
data to a remote over HTTP or HTTPS.  If the data is larger than this
size, libcurl, which handles the HTTP support for Git, will use chunked
transfer encoding since it isn&#8217;t known ahead of time what the size of
the pushed data will be.</p>
<div class="paragraph">
<p>Leaving this value at the default size is fine unless you know that either the
remote server or a proxy in the middle doesn&#8217;t support HTTP/1.1 (which
introduced the chunked transfer encoding) or is known to be broken with chunked
data.  This is often (erroneously) suggested as a solution for generic push
problems, but since almost every server and proxy supports at least HTTP/1.1,
raising this value usually doesn&#8217;t solve most push problems.  A server or proxy
that didn&#8217;t correctly support HTTP/1.1 and chunked transfer encoding wouldn&#8217;t be
that useful on the Internet today, since it would break lots of traffic.</p>
</div>
<div class="paragraph">
<p>Note that increasing this value will increase the memory used on every relevant
push that Git does over HTTP or HTTPS, since the entire buffer is allocated
regardless of whether or not it is all used.  Thus, it&#8217;s best to leave it at the
default unless you are sure you need a different value.</p>
</div>
</dd>
</dl>
</div>
<div id="configure-editor" class="dlist">
<dl>
<dt class="hdlist1">How do I configure a different editor?</dt>
<dd>
<p>If you haven&#8217;t specified an editor specifically for Git, it will by default
use the editor you&#8217;ve configured using the <code>VISUAL</code> or <code>EDITOR</code> environment
variables, or if neither is specified, the system default (which is usually
<code>vi</code>).  Since some people find <code>vi</code> difficult to use or prefer a different
editor, it may be desirable to change the editor used.</p>
<div class="paragraph">
<p>If you want to configure a general editor for most programs which need one, you
can edit your shell configuration (e.g., <code>~/.bashrc</code> or <code>~/.zshenv</code>) to contain
a line setting the <code>EDITOR</code> or <code>VISUAL</code> environment variable to an appropriate
value.  For example, if you prefer the editor <code>nano</code>, then you could write the
following:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>export VISUAL=nano</pre>
</div>
</div>
<div class="paragraph">
<p>If you want to configure an editor specifically for Git, you can either set the
<code>core.editor</code> configuration value or the <code>GIT_EDITOR</code> environment variable.  You
can see <a href="git-var.html">git-var(1)</a> for details on the order in which these options are
consulted.</p>
</div>
<div class="paragraph">
<p>Note that in all cases, the editor value will be passed to the shell, so any
arguments containing spaces should be appropriately quoted.  Additionally, if
your editor normally detaches from the terminal when invoked, you should specify
it with an argument that makes it not do that, or else Git will not see any
changes.  An example of a configuration addressing both of these issues on
Windows would be the configuration <code>"C:\Program Files\Vim\gvim.exe" --nofork</code>,
which quotes the filename with spaces and specifies the <code>--nofork</code> option to
avoid backgrounding the process.</p>
</div>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_credentials">Credentials</h2>
<div class="sectionbody">
<div id="http-credentials" class="dlist">
<dl>
<dt class="hdlist1">How do I specify my credentials when pushing over HTTP?</dt>
<dd>
<p>The easiest way to do this is to use a credential helper via the
<code>credential.helper</code> configuration.  Most systems provide a standard
choice to integrate with the system credential manager.  For example,
Git for Windows provides the <code>wincred</code> credential manager, macOS has the
<code>osxkeychain</code> credential manager, and Unix systems with a standard
desktop environment can use the <code>libsecret</code> credential manager.  All of
these store credentials in an encrypted store to keep your passwords or
tokens secure.</p>
<div class="paragraph">
<p>In addition, you can use the <code>store</code> credential manager which stores in a file
in your home directory, or the <code>cache</code> credential manager, which does not
permanently store your credentials, but does prevent you from being prompted for
them for a certain period of time.</p>
</div>
<div class="paragraph">
<p>You can also just enter your password when prompted.  While it is possible to
place the password (which must be percent-encoded) in the URL, this is not
particularly secure and can lead to accidental exposure of credentials, so it is
not recommended.</p>
</div>
</dd>
</dl>
</div>
<div id="http-credentials-environment" class="dlist">
<dl>
<dt class="hdlist1">How do I read a password or token from an environment variable?</dt>
<dd>
<p>The <code>credential.helper</code> configuration option can also take an arbitrary
shell command that produces the credential protocol on standard output.
This is useful when passing credentials into a container, for example.</p>
<div class="paragraph">
<p>Such a shell command can be specified by starting the option value with an
exclamation point.  If your password or token were stored in the <code>GIT_TOKEN</code>,
you could run the following command to set your credential helper:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>$ git config credential.helper \
        '!f() { echo username=author; echo "password=$GIT_TOKEN"; };f'</pre>
</div>
</div>
</dd>
</dl>
</div>
<div id="http-reset-credentials" class="dlist">
<dl>
<dt class="hdlist1">How do I change the password or token I&#8217;ve saved in my credential manager?</dt>
<dd>
<p>Usually, if the password or token is invalid, Git will erase it and
prompt for a new one.  However, there are times when this doesn&#8217;t always
happen.  To change the password or token, you can erase the existing
credentials and then Git will prompt for new ones.  To erase
credentials, use a syntax like the following (substituting your username
and the hostname):</p>
<div class="listingblock">
<div class="content">
<pre>$ echo url=https://author@git.example.org | git credential reject</pre>
</div>
</div>
</dd>
</dl>
</div>
<div id="multiple-accounts-http" class="dlist">
<dl>
<dt class="hdlist1">How do I use multiple accounts with the same hosting provider using HTTP?</dt>
<dd>
<p>Usually the easiest way to distinguish between these accounts is to use
the username in the URL.  For example, if you have the accounts <code>author</code>
and <code>committer</code> on <code>git.example.org</code>, you can use the URLs
<a href="https://author@git.example.org/org1/project1.git" class="bare">https://author@git.example.org/org1/project1.git</a> and
<a href="https://committer@git.example.org/org2/project2.git" class="bare">https://committer@git.example.org/org2/project2.git</a>.  This way, when you
use a credential helper, it will automatically try to look up the
correct credentials for your account.  If you already have a remote set
up, you can change the URL with something like <code>git remote set-url
origin https://author@git.example.org/org1/project1.git</code> (see
<a href="git-remote.html">git-remote(1)</a> for details).</p>
</dd>
</dl>
</div>
<div id="multiple-accounts-ssh" class="dlist">
<dl>
<dt class="hdlist1">How do I use multiple accounts with the same hosting provider using SSH?</dt>
<dd>
<p>With most hosting providers that support SSH, a single key pair uniquely
identifies a user.  Therefore, to use multiple accounts, it&#8217;s necessary
to create a key pair for each account.  If you&#8217;re using a reasonably
modern OpenSSH version, you can create a new key pair with something
like <code>ssh-keygen -t ed25519 -f ~/.ssh/id_committer</code>.  You can then
register the public key (in this case, <code>~/.ssh/id_committer.pub</code>; note
the <code>.pub</code>) with the hosting provider.</p>
<div class="paragraph">
<p>Most hosting providers use a single SSH account for pushing; that is, all users
push to the <code>git</code> account (e.g., <code>git@git.example.org</code>).  If that&#8217;s the case for
your provider, you can set up multiple aliases in SSH to make it clear which key
pair to use.  For example, you could write something like the following in
<code>~/.ssh/config</code>, substituting the proper private key file:</p>
</div>
<div class="listingblock">
<div class="content">
<pre># This is the account for author on git.example.org.
Host example_author
        HostName git.example.org
        User git
        # This is the key pair registered for author with git.example.org.
        IdentityFile ~/.ssh/id_author
        IdentitiesOnly yes
# This is the account for committer on git.example.org.
Host example_committer
        HostName git.example.org
        User git
        # This is the key pair registered for committer with git.example.org.
        IdentityFile ~/.ssh/id_committer
        IdentitiesOnly yes</pre>
</div>
</div>
<div class="paragraph">
<p>Then, you can adjust your push URL to use <code>git@example_author</code> or
<code>git@example_committer</code> instead of <code>git@example.org</code> (e.g., <code>git remote set-url
git@example_author:org1/project1.git</code>).</p>
</div>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_common_issues">Common Issues</h2>
<div class="sectionbody">
<div id="last-commit-amend" class="dlist">
<dl>
<dt class="hdlist1">I&#8217;ve made a mistake in the last commit.  How do I change it?</dt>
<dd>
<p>You can make the appropriate change to your working tree, run <code>git add
&lt;file&gt;</code> or <code>git rm &lt;file&gt;</code>, as appropriate, to stage it, and then <code>git
commit --amend</code>.  Your change will be included in the commit, and you&#8217;ll
be prompted to edit the commit message again; if you wish to use the
original message verbatim, you can use the <code>--no-edit</code> option to <code>git
commit</code> in addition, or just save and quit when your editor opens.</p>
</dd>
</dl>
</div>
<div id="undo-previous-change" class="dlist">
<dl>
<dt class="hdlist1">I&#8217;ve made a change with a bug and it&#8217;s been included in the main branch.  How should I undo it?</dt>
<dd>
<p>The usual way to deal with this is to use <code>git revert</code>.  This preserves
the history that the original change was made and was a valuable
contribution, but also introduces a new commit that undoes those changes
because the original had a problem.  The commit message of the revert
indicates the commit which was reverted and is usually edited to include
an explanation as to why the revert was made.</p>
</dd>
</dl>
</div>
<div id="ignore-tracked-files" class="dlist">
<dl>
<dt class="hdlist1">How do I ignore changes to a tracked file?</dt>
<dd>
<p>Git doesn&#8217;t provide a way to do this.  The reason is that if Git needs
to overwrite this file, such as during a checkout, it doesn&#8217;t know
whether the changes to the file are precious and should be kept, or
whether they are irrelevant and can safely be destroyed.  Therefore, it
has to take the safe route and always preserve them.</p>
<div class="paragraph">
<p>It&#8217;s tempting to try to use certain features of <code>git update-index</code>, namely the
assume-unchanged and skip-worktree bits, but these don&#8217;t work properly for this
purpose and shouldn&#8217;t be used this way.</p>
</div>
<div class="paragraph">
<p>If your goal is to modify a configuration file, it can often be helpful to have
a file checked into the repository which is a template or set of defaults which
can then be copied alongside and modified as appropriate.  This second, modified
file is usually ignored to prevent accidentally committing it.</p>
</div>
</dd>
</dl>
</div>
<div id="files-in-gitignore-are-tracked" class="dlist">
<dl>
<dt class="hdlist1">I asked Git to ignore various files, yet they are still tracked</dt>
<dd>
<p>A <code>gitignore</code> file ensures that certain file(s) which are not
tracked by Git remain untracked.  However, sometimes particular
file(s) may have been tracked before adding them into the
<code>.gitignore</code>, hence they still remain tracked.  To untrack and
ignore files/patterns, use <code>git rm --cached &lt;file/pattern&gt;</code>
and add a pattern to <code>.gitignore</code> that matches the &lt;file&gt;.
See <a href="gitignore.html">gitignore(5)</a> for details.</p>
</dd>
</dl>
</div>
<div id="fetching-and-pulling" class="dlist">
<dl>
<dt class="hdlist1">How do I know if I want to do a fetch or a pull?</dt>
<dd>
<p>A fetch stores a copy of the latest changes from the remote
repository, without modifying the working tree or current branch.
You can then at your leisure inspect, merge, rebase on top of, or
ignore the upstream changes.  A pull consists of a fetch followed
immediately by either a merge or rebase.  See <a href="git-pull.html">git-pull(1)</a>.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_hooks">Hooks</h2>
<div class="sectionbody">
<div id="restrict-with-hooks" class="dlist">
<dl>
<dt class="hdlist1">How do I use hooks to prevent users from making certain changes?</dt>
<dd>
<p>The only safe place to make these changes is on the remote repository
(i.e., the Git server), usually in the <code>pre-receive</code> hook or in a
continuous integration (CI) system.  These are the locations in which
policy can be enforced effectively.</p>
<div class="paragraph">
<p>It&#8217;s common to try to use <code>pre-commit</code> hooks (or, for commit messages,
<code>commit-msg</code> hooks) to check these things, which is great if you&#8217;re working as a
solo developer and want the tooling to help you.  However, using hooks on a
developer machine is not effective as a policy control because a user can bypass
these hooks with <code>--no-verify</code> without being noticed (among various other ways).
Git assumes that the user is in control of their local repositories and doesn&#8217;t
try to prevent this or tattle on the user.</p>
</div>
<div class="paragraph">
<p>In addition, some advanced users find <code>pre-commit</code> hooks to be an impediment to
workflows that use temporary commits to stage work in progress or that create
fixup commits, so it&#8217;s better to push these kinds of checks to the server
anyway.</p>
</div>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_cross_platform_issues">Cross-Platform Issues</h2>
<div class="sectionbody">
<div id="windows-text-binary" class="dlist">
<dl>
<dt class="hdlist1">I&#8217;m on Windows and my text files are detected as binary.</dt>
<dd>
<p>Git works best when you store text files as UTF-8.  Many programs on
Windows support UTF-8, but some do not and only use the little-endian
UTF-16 format, which Git detects as binary.  If you can&#8217;t use UTF-8 with
your programs, you can specify a working tree encoding that indicates
which encoding your files should be checked out with, while still
storing these files as UTF-8 in the repository.  This allows tools like
<a href="git-diff.html">git-diff(1)</a> to work as expected, while still allowing your tools
to work.</p>
<div class="paragraph">
<p>To do so, you can specify a <a href="gitattributes.html">gitattributes(5)</a> pattern with the
<code>working-tree-encoding</code> attribute.  For example, the following pattern sets all
C files to use UTF-16LE-BOM, which is a common encoding on Windows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre>*.c     working-tree-encoding=UTF-16LE-BOM</pre>
</div>
</div>
<div class="paragraph">
<p>You will need to run <code>git add --renormalize</code> to have this take effect.  Note
that if you are making these changes on a project that is used across platforms,
you&#8217;ll probably want to make it in a per-user configuration file or in the one
in <code>$GIT_DIR/info/attributes</code>, since making it in a <code>.gitattributes</code> file in the
repository will apply to all users of the repository.</p>
</div>
<div class="paragraph">
<p>See the following entry for information about normalizing line endings as well,
and see <a href="gitattributes.html">gitattributes(5)</a> for more information about attribute files.</p>
</div>
</dd>
</dl>
</div>
<div id="windows-diff-control-m" class="dlist">
<dl>
<dt class="hdlist1">I&#8217;m on Windows and git diff shows my files as having a <code>^M</code> at the end.</dt>
<dd>
<p>By default, Git expects files to be stored with Unix line endings.  As such,
the carriage return (<code>^M</code>) that is part of a Windows line ending is shown
because it is considered to be trailing whitespace.  Git defaults to showing
trailing whitespace only on new lines, not existing ones.</p>
<div class="paragraph">
<p>You can store the files in the repository with Unix line endings and convert
them automatically to your platform&#8217;s line endings.  To do that, set the
configuration option <code>core.eol</code> to <code>native</code> and see the following entry for
information about how to configure files as text or binary.</p>
</div>
<div class="paragraph">
<p>You can also control this behavior with the <code>core.whitespace</code> setting if you
don&#8217;t wish to remove the carriage returns from your line endings.</p>
</div>
</dd>
</dl>
</div>
<div id="recommended-storage-settings" class="dlist">
<dl>
<dt class="hdlist1">What&#8217;s the recommended way to store files in Git?</dt>
<dd>
<p>While Git can store and handle any file of any type, there are some
settings that work better than others.  In general, we recommend that
text files be stored in UTF-8 without a byte-order mark (BOM) with LF
(Unix-style) endings.  We also recommend the use of UTF-8 (again,
without BOM) in commit messages.  These are the settings that work best
across platforms and with tools such as <code>git diff</code> and <code>git merge</code>.</p>
<div class="paragraph">
<p>Additionally, if you have a choice between storage formats that are text based
or non-text based, we recommend storing files in the text format and, if
necessary, transforming them into the other format.  For example, a text-based
SQL dump with one record per line will work much better for diffing and merging
than an actual database file.  Similarly, text-based formats such as Markdown
and AsciiDoc will work better than binary formats such as Microsoft Word and
PDF.</p>
</div>
<div class="paragraph">
<p>Similarly, storing binary dependencies (e.g., shared libraries or JAR files) or
build products in the repository is generally not recommended.  Dependencies and
build products are best stored on an artifact or package server with only
references, URLs, and hashes stored in the repository.</p>
</div>
<div class="paragraph">
<p>We also recommend setting a <a href="gitattributes.html">gitattributes(5)</a> file to explicitly mark
which files are text and which are binary.  If you want Git to guess, you can
set the attribute <code>text=auto</code>.  For example, the following might be appropriate
in some projects:</p>
</div>
<div class="listingblock">
<div class="content">
<pre># By default, guess.
*       text=auto
# Mark all C files as text.
*.c     text
# Mark all JPEG files as binary.
*.jpg   binary</pre>
</div>
</div>
<div class="paragraph">
<p>These settings help tools pick the right format for output such as patches and
result in files being checked out in the appropriate line ending for the
platform.</p>
</div>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_git">GIT</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Part of the <a href="git.html">git(1)</a> suite</p>
</div>
</div>
</div>
</div>
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<div id="footer-text">
Last updated 2020-07-28 08:59:54 UTC
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